function HS_DateAdd(interval,number,date){
	number = parseInt(number);
	if (typeof(date)=="string"){var date = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2])}
	if (typeof(date)=="object"){var date = date}
	switch(interval){
	case "y":return new Date(date.getFullYear()+number,date.getMonth(),date.getDate()); break;
	case "m":return new Date(date.getFullYear(),date.getMonth()+number,checkDate(date.getFullYear(),date.getMonth()+number,date.getDate())); break;
	case "d":return new Date(date.getFullYear(),date.getMonth(),date.getDate()+number); break;
	case "w":return new Date(date.getFullYear(),date.getMonth(),7*number+date.getDate()); break;
	}
}
function checkDate(year,month,date){
	var enddate = ["31","28","31","30","31","30","31","31","30","31","30","31"];
	var returnDate = "";
	if (year%4==0){enddate[1]="29"}
	if (date>enddate[month]){returnDate = enddate[month]}else{returnDate = date}
	return returnDate;
}

function WeekDay(date){
	var theDate;
	if (typeof(date)=="string"){theDate = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2]);}
	if (typeof(date)=="object"){theDate = date}
	return theDate.getDay();
}
function HS_calendar(){
	var lis = "";
	var style = "";
	/*可以把下面的css剪切出去独立一个css文件webjx.com*/
	style +="<style type='text/css'>";
	style +=".calendar { width:170px; height:auto; font-size:12px; margin-right:14px; background:url(calendarbg.gif) no-repeat right center #fff; border:1px solid #397EAE; padding:1px}";
	style +=".calendar ul {list-style-type:none; margin:0; padding:0;}";
	style +=".calendar .day { background-color:#EDF5FF; height:20px;}";
	style +=".calendar .day li,.calendar .date li{ float:left; width:14%; height:20px; line-height:20px; text-align:center}";
	style +=".calendar li a { text-decoration:none; font-family:Tahoma; font-size:11px; color:#333}";
	style +=".calendar li a:hover { color:#f30; text-decoration:underline}";
	style +=".calendar li a.hasArticle {font-weight:bold; color:#f60 !important}";
	style +=".lastMonthDate, .nextMonthDate {color:#bbb;font-size:11px}";
	style +=".selectThisYear a, .selectThisMonth a{text-decoration:none; margin:0 2px; color:#000; font-weight:bold}";
	style +=".calendar .LastMonth, .calendar .NextMonth{ text-decoration:none; color:#000; font-size:18px; font-weight:bold; line-height:16px;}";
	style +=".calendar .LastMonth { float:left;}";
	style +=".calendar .NextMonth { float:right;}";
	style +=".calendarBody {clear:both}";
	style +=".calendarTitle {text-align:center;height:20px; line-height:20px; clear:both}";
	style +=".today { background-color:#ffffaa;border:1px solid #f60; padding:2px}";
	style +=".today a { color:#f30; }";
	style +=".calendarBottom {clear:both; border-top:1px solid #ddd; padding: 3px 0; text-align:left}";
	style +=".calendarBottom a {text-decoration:none; margin:2px !important; font-weight:bold; color:#000}";
	style +=".calendarBottom a.closeCalendar{float:right}";
	style +=".closeCalendarBox {float:right; border:1px solid #000; background:#fff; font-size:9px; width:11px; height:11px; line-height:11px; text-align:center;overflow:hidden; font-weight:normal !important}";
	style +="</style>";

	var now;
	if (typeof(arguments[0])=="string"){
		selectDate = arguments[0].split("-");
		var year = selectDate[0];
		var month = parseInt(selectDate[1])-1+"";
		var date = selectDate[2];
		now = new Date(year,month,date);
	}else if (typeof(arguments[0])=="object"){
		now = arguments[0];
	}
	var lastMonthEndDate = HS_DateAdd("d","-1",now.getFullYear()+"-"+now.getMonth()+"-01").getDate();
	var lastMonthDate = WeekDay(now.getFullYear()+"-"+now.getMonth()+"-01");
	var thisMonthLastDate = HS_DateAdd("d","-1",now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-01");
	var thisMonthEndDate = thisMonthLastDate.getDate();
	var thisMonthEndDay = thisMonthLastDate.getDay();
	var todayObj = new Date();
	today = todayObj.getFullYear()+"-"+todayObj.getMonth()+"-"+todayObj.getDate();
	
	for (i=0; i<lastMonthDate; i++){  // Last Month's Date
		lis = "<li class='lastMonthDate'>"+lastMonthEndDate+"</li>" + lis;
		lastMonthEndDate--;
	}
	for (i=1; i<=thisMonthEndDate; i++){ // Current Month's Date

		if(today == now.getFullYear()+"-"+now.getMonth()+"-"+i){
			var todayString = now.getFullYear()+"-"+paddingLeft((parseInt(now.getMonth())+1),2,"0")+"-"+paddingLeft(i,2,"0");
			lis += "<li><a href='#' class='today' onclick='_selectThisDay(this)' title='"+now.getFullYear()+"-"+paddingLeft((parseInt(now.getMonth())+1),2,"0")+"-"+paddingLeft(i,2,"0")+"'>"+i+"</a></li>";
		}else{
		lis += "<li><a href='#' onclick='_selectThisDay(this)' title='" + now.getFullYear() + "-" + paddingLeft((parseInt(now.getMonth()) + 1), 2, "0") + "-" + paddingLeft(i,2,"0") + "'>" + i + "</a></li>";
		}
		
	}
	var j=1;
	for (i=thisMonthEndDay; i<6; i++){  // Next Month's Date
		lis += "<li class='nextMonthDate'>"+j+"</li>";
		j++;
	}
	lis += style;

	var CalendarTitle = "<a href='#' class='NextMonth' onclick=HS_calendar(HS_DateAdd('m',1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this) title='Next Month'>»</a>";
	CalendarTitle += "<a href='#' class='LastMonth' onclick=HS_calendar(HS_DateAdd('m',-1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this) title='Previous Month'>«</a>";
	CalendarTitle += "<span class='selectThisYear'><a href='#' onclick='CalendarselectYear(this)' title='Click here to select other year' >"+now.getFullYear()+"</a></span>年<span class='selectThisMonth'><a href='#' onclick='CalendarselectMonth(this)' title='Click here to select other month'>"+(parseInt(now.getMonth())+1).toString()+"</a></span>月"; 

	if (arguments.length>1){
		arguments[1].parentNode.parentNode.getElementsByTagName("ul")[1].innerHTML = lis;
		arguments[1].parentNode.innerHTML = CalendarTitle;

	}else{
		var CalendarBox = style+"<div class='calendar'><div class='calendarTitle'>"+CalendarTitle+"</div><div class='calendarBody'><ul class='day'><li>日</li><li>一</li><li>二</li><li>三</li><li>四</li><li>五</li><li>六</li></ul><ul class='date' id='thisMonthDate'>"+lis+"</ul></div><div class='calendarBottom'><a href='#' class='closeCalendar' onclick='closeCalendar(this)'>×</a><span><span><a href='#' onclick='_selectThisDay(this)' title='"+todayString+"'>Today</a></span></span></div></div>";
		return CalendarBox;
	}
}
function _selectThisDay(d){
	var boxObj = d.parentNode.parentNode.parentNode.parentNode.parentNode;
	boxObj.targetObj.value = d.title;
		boxObj.parentNode.removeChild(boxObj);
}
function closeCalendar(d){
	var boxObj = d.parentNode.parentNode.parentNode;
		boxObj.parentNode.removeChild(boxObj);
}

function CalendarselectYear(obj){
		var opt = "";
		var thisYear = obj.innerHTML;
		for (i=1970; i<=2020; i++){
			if (i==thisYear){
				opt += "<option value="+i+" selected>"+i+"</option>";
			}else{
				opt += "<option value="+i+">"+i+"</option>";
			}
		}
		opt = "<select onblur='selectThisYear(this)' onchange='selectThisYear(this)' style='font-size:11px'>"+opt+"</select>";
		obj.parentNode.innerHTML = opt;
}

function selectThisYear(obj){
	HS_calendar(obj.value+"-"+obj.parentNode.parentNode.getElementsByTagName("span")[1].getElementsByTagName("a")[0].innerHTML+"-1",obj.parentNode);
}

function CalendarselectMonth(obj){
		var opt = "";
		var thisMonth = obj.innerHTML;
		for (i=1; i<=12; i++){
			if (i==thisMonth){
				opt += "<option value="+i+" selected>"+i+"</option>";
			}else{
				opt += "<option value="+i+">"+i+"</option>";
			}
		}
		opt = "<select onblur='selectThisMonth(this)' onchange='selectThisMonth(this)' style='font-size:11px'>"+opt+"</select>";
		obj.parentNode.innerHTML = opt;
}
function selectThisMonth(obj){
	HS_calendar(obj.parentNode.parentNode.getElementsByTagName("span")[0].getElementsByTagName("a")[0].innerHTML+"-"+obj.value+"-1",obj.parentNode);
}
function GetPosition(element)
{
    if (arguments.length != 1 || element == null) {
        return null;
    }
    var elmt = element;
    var offsetTop = elmt.offsetTop;
    var offsetLeft = elmt.offsetLeft;

    while (elmt = elmt.offsetParent) {
        // add this judge   
        if (elmt.style.position == 'absolute' || elmt.style.position == 'relative' || (elmt.style.overflow != 'visible' && elmt.style.overflow != '')) {
            break;
        }
        offsetTop += elmt.offsetTop;
        offsetLeft += elmt.offsetLeft;
    }
    return { Y: offsetTop, X: offsetLeft };
}
function paddingLeft(str, length, chara)
{
    str = str.toString();
    var delta = length - str.length;
    for (var i = 0; i < delta; i++) {
        str = chara + str;
    }
    return str;
}
function HS_setDate(inputObj){
    HS_setDate2(inputObj, inputObj);
}
function HS_setDate2(inputObj,callObj)
{
    var calendarObj = document.createElement("span");
    calendarObj.innerHTML = HS_calendar(new Date());
    calendarObj.style.position = "absolute";
    calendarObj.targetObj = inputObj;
    inputObj.parentNode.insertBefore(calendarObj, inputObj.nextSibling);
    var pos = GetPosition(callObj);
    calendarObj.style.left = pos.X + "px";
    calendarObj.style.top = pos.Y + callObj.clientHeight + 5 + "px";
}